adbosch, it looks like you might have a defective battery in your reader as
kgn also suspected. Like
brainycat I read about 1000 pages weekly with automatic rotation is off and without doing anything with wifi, notes, etc - just plain reading 98% of the time. I haven't charged the reader for about 2.5 weeks (2000 - 2500 pages total) and only one bar is gone so far.
After reading this topic I became curios and kind of trying to see how long the buttery will last in mine PB302